Why does food generally taste bland when you have a severe head cold

A)  Your cold will cause the sweet receptors in your mouth to become inactivated. 
B)  Your high temperature will cause your brain to block signals from the taste buds in the mouth. 
C)  Your naturally produced antibodies interfere with chemical molecules stimulated by your taste buds. 
D)  Flavour is influenced by smell as well as taste, and with a reduced sense of smell, your sense of taste will be diminished.